Moisture and temperature influence on mechanical behavior of PPS/buckypapers carbon fiber laminates

Abstract

In this work, multiwall carbon nanotubes (MWCNT) were dispersed in water with the assistance of water based surfactant and then sonicated in order to obtain a very well dispersed solution. The suspension was filtrate under vaccum conditions, generating a thin film called buckypapers (BP). Poly (phenylene sulphide) (PPS) reinforced carbon fiber (CF) and PPS reinforced CF/BP composites were manufactured through hot compression molding technique. Subsequently the samples were exposed to extreme humidity (90% of moisture) combined with high temperature (80 °C). The mechanical properties of the laminates were evaluated by dynamic mechanical analysis, compression shear test, interlaminar shear strength and impulse excitation of vibration. Volume fraction of pores were 10.93% for PPS/CF and 16.18% for PPS/BP/CF, indicating that the hot compression molding parameters employed in this investigation (1.4 MPa, 5 min and 330 °C) affected both the consolidation quality of the composites and the mechanical properties of the final laminates.

Processing, thermal and mechanical behaviour of PEI/MWCNT/carbon fiber nanostructured laminate

“…In the case of the PEI/MWCNT film, a reduction in T g was observed. According to previous works [28,30], the reduction of the glass transition temperature by the use of surfactants during the dispersion of nanoparticles may be associated with a plasticizer effect in the matrix, showing an increase in the mobility of the polymer chains and, consequently, a reduction in the T g of the composite.…”

“…This test consists of the generation of a direct shear load along the interlaminar interface and forces the separator to break in pure shear. The distribution of the shear stress is almost uniform across the thickness with two peaks close to the edges of the loading surface [26][27][28]. To perform this test, 5 specimens with dimensions of (10 × 10 × 3) mm were used, the test speed was 0.25 mm min −1 and 10 KN load cell.…”

The influence of carbon nanotube buckypaper/poly (ether imide) mats on the thermal properties of poly (ether imide) and poly (aryl ether ketone)/carbon fiber laminates

“…As an alternative to the points previously mentioned, CNTs films, better known as buckypapers (BP), has been increasingly used by researchers [16][17][18]. BPs can be defined as thin films, with a thickness of the order of 50-100 μm, displaying a highly porous structure formed by a dense network of carbon nanotubes linked cohesively by van der Waals forces [19,20].…”

A review on research, application, processing, and recycling of PPS based materials

“…Another problem in PPS processing is the atmosphere in which it is carried out, since the presence of oxygen in contact with the polymer at a high temperature can lead to a degradation of its chains, reducing the properties and useful life of the final part [20,49] .…”

“…For PPS, the literature shows that drying must be carried out at a temperature of 120 °C for 3 h [20] . If the PPS has some carbonaceous load, drying is essential, as water absorption increases in these cases [20,49,53] .…”